This Handler class should be static or leaks maight occur

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在使用Handler更新UI的时候出现警告：

意思是说：这个Handler 必须是static的，否则就会引发内存泄露。

解决：
让Handler持有一个对Activity的WeakReference，这样就不会泄露Activity的上下文了：

public class TestActivity extends AppCompatActivity {private final MyHandler mMyHandler = new MyHandler(this);@Overrideprotected void onCreate(@Nullable Bundle savedInstanceState) {super.onCreate(savedInstanceState);mMyHandler.postDelayed(new Runnable() {@Overridepublic void run() {// TODO: 2018/3/2  }}, 60 * 10 * 1000);}private static class MyHandler extends Handler {private WeakReference<TestActivity> mWeakReference = null;private MyHandler(TestActivity activity) {mWeakReference = new WeakReference<TestActivity>(activity);}@Overridepublic void handleMessage(Message msg) {super.handleMessage(msg);TestActivity activity = mWeakReference.get();if (activity != null) {// TODO: 2018/3/2}}}
}

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